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same-as-for-resource-in-field.ts
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same-as-for-resource-in-field.ts
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import type { ActionName } from "../../action.js";
import type Collection from "../../chip-types/collection.js";
import Policy from "../../chip-types/policy.js";
import { AllowAll } from "../../datastore/allow-all.js";
import DenyAll from "../../datastore/deny-all.js";
import type QueryStage from "../../datastore/query-stage.js";
import {
App,
CollectionItem,
Context,
Field,
FieldTypes,
Query,
} from "../../main.js";
export default class SameAsForResourceInField extends Policy {
static type_name = "same-as-for-resource-in-field";
current_collection: string;
field: string;
action_name: ActionName;
constructor({
action_name,
collection_name,
field,
}: {
action_name: ActionName;
collection_name: string;
field: string;
}) {
super({ action_name, collection_name, field });
this.current_collection = collection_name;
this.action_name = action_name;
this.field = field;
}
getCollection(app: App): Collection {
return app.collections[this.current_collection];
}
getReferencedCollection(context: Context): Collection {
const field = this.getField(context);
return field instanceof FieldTypes.SingleReference
? field.getTargetCollection(context)
: (
field as FieldTypes.ReverseSingleReference
).getReferencingCollection();
}
getReferencedPolicy(context: Context): Policy {
return this.getReferencedCollection(context).getPolicy(
this.action_name
);
}
getField(context: Context): Field {
const collection = this.getCollection(context.app);
const ret = collection.fields[this.field];
if (!ret) {
throw new Error(
`Cannot find field '${this.field}' in collection '${collection.name}'. Perhaps it's a typo?`
);
}
return ret;
}
async _getRestrictingQuery(context: Context) {
const referenced_restricting_query = await this.getReferencedPolicy(
context
).getRestrictingQuery(context);
if (
referenced_restricting_query instanceof DenyAll ||
referenced_restricting_query instanceof AllowAll
) {
return referenced_restricting_query;
}
const query = new Query();
let parent_prefix: string;
if (this.getField(context) instanceof FieldTypes.SingleReference) {
parent_prefix = query.lookup({
from: this.getReferencedCollection(context).name,
localField: this.field,
foreignField: "id",
});
} else {
//assuming ReverseSingleReference;
parent_prefix = query.lookup({
from: this.getReferencedCollection(context).name,
let: { value: `$${this.field}.value` },
pipeline: [{ $match: { $expr: { $in: ["$id", "$$value"] } } }],
});
}
const referenced_restricting_pipeline = referenced_restricting_query
.prefix(parent_prefix)
.toPipeline();
const keep_fields: Record<string, Record<"$first", string>> = {
id: { $first: `$id` },
}; // this object will help preserve the original fields after $group stage, which serves as a reverse to $unwind
for (const field_name in this.getCollection(context.app).fields) {
keep_fields[field_name] = { $first: `$${field_name}` };
}
const pipeline: QueryStage[] = [
...query.toPipeline(),
{ $unwind: parent_prefix },
...referenced_restricting_pipeline,
{
$group: {
_id: "$_id",
[parent_prefix]: {
$push: `$${parent_prefix}`,
},
...keep_fields,
},
},
];
return Query.fromCustomPipeline(pipeline);
}
async checkerFunction(
context: Context,
item_getter: () => Promise<CollectionItem>
) {
if (!item_getter) {
return null;
}
const item: CollectionItem = await item_getter();
const field = await item.getDecoded(this.field, context);
const response = this.getReferencedCollection(context).suGetByID(
field as string
);
const ret = await this.getReferencedPolicy(context).check(
context,
() => response
);
return ret;
}
async isItemSensitive(context: Context) {
return this.getReferencedPolicy(context).isItemSensitive(context);
}
}

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